Questions tagged [landing]

Questions regarding the specific part of flights, during which a spacecraft touches down on the solid ground of a celestial body.

Filter by
Sorted by
Tagged with
36
votes
3answers
6k views

Why was it necessary to program InSight with an ability to land in dust storms?

If the entire event of EDL (Entry - Descent - Landing) is going to take only 7 minutes and if the command to begin could be signalled based on ground weather conditions, why was it necessary to take ...
4
votes
1answer
141 views

How do Mars spacecraft control attitude on final descent and landing?

When I watch videos of probes landing on Mars after cutting the parachutes off, they show the lander doing final orientation adjustments before touching down. The engines don't seem to have a ...
2
votes
1answer
310 views

Could a shuttle be built for Mars?

Mars does have an atmosphere, but is there enough atmosphere to glide, shed speed and land if there was a runway? What would this require from the shuttle, in terms of aerodynamics?
11
votes
5answers
898 views

Is it possible to navigate space travel with no computer?

From launch to land could a person travel in space with only mechanical devices like a sextant? With enough experience what would be the minimum devices needed? Which vehicle currently would be easier ...
1
vote
0answers
144 views

Details about the BFR abort procedures?

What kind of emergency procedures will the BFR have during landings? I can see an abort to an alternate landing zone but what about when you have a an emergency ten seconds after engine shutdown?
5
votes
0answers
168 views

Purging process of a rocket engine

Does spacex purge Falcon 9 engines after landing ? If so, which gas is used for purging?
7
votes
4answers
1k views

Wasn't the moon landing + reentry much harder to do than SpaceX's reusable rockets/boosters?

Over 45 years ago, we know that USA/Russia were able to send satellites/humans and return them to the Earth. Isn't that supposed to be much more difficult to do than what SpaceX is doing now by ...
10
votes
2answers
270 views

How, in the SpaceX Mars stack, do they plan to address de novo landing sites?

Given a new, unprepared "in the field" landing site for a rocket, what is the SpaceX strategy? Are the landing legs intended to be rated to handle that kind of instability? How can they possibly be? ...
3
votes
1answer
116 views

Nadir sensor for a spacecraft attempting to land

Is it possible theoretically for a sensor to detect Nadir? This could actually be of extreme value as generally spacecraft attempting to land need to maintain certain heading w.r.t Nadir as a function ...
1
vote
1answer
237 views

Could an inflatable heat shield be used on the SpaceX Mars Lander?

Could light weight inflatable heat shields be used like parachutes from NASA to increase surface area for the SpaceX Mars lander further decreasing velocity? Where would be the best placement of them? ...
10
votes
1answer
699 views

Can Stratolaunch land with the rocket still attached?

Is the Stratolaunch plane able to land with the rocket still attached, if a malfunction is detected – and the plane has to return without having launched its load? Is there a known emergency ...
14
votes
2answers
3k views

Why does the SpaceX first stage booster boost up and back after separation not just back?

By boosting up and back after separation aren't you just putting more energy in that you'll have to counter with additional deceleration later? Why not just accelerate back, which will use less energy ...
0
votes
1answer
234 views

Could a reentry powered monorail and flywheel make a kinetic engine for lift?

On reentry could a flywheel spin on a magnetic bearing creating a centrifugal force to keep the ship level whilst creating a plasma air pocket from the pits in the rotating heat shield? This would ...
5
votes
1answer
557 views

Does deploying the parachute dehermetize Soyuz?

When watching the Year in Orbit documentary, one of cosmonauts points to the big bags stowed between/above the seats of Soyuz capsule, identifying them as the main and emergency parachutes. But they ...
6
votes
1answer
161 views

Is the atmosphere a positive or a negative for reusability?

Does the atmosphere provide a benefit or detriment in terms of fuel economy for rockets that take off and land back on Earth? We know that the atmosphere plays a large role in helping slow down ...
5
votes
0answers
274 views

Does the downrange position of an ASDS vary, depending on payload mass?

SpaceX in its recovery attempts can either do a Return To Launch Site (RTLS) or land downrange on an ASDS landing barge. The Telesat 19V and 18V payloads were some of the heaviest payloads on the ...
44
votes
4answers
10k views

Why can't Falcon 9 fairings touch the water?

SpaceX is spending considerable effort to catch Falcon 9 fairings into a giant net on a ship. I am aware that salt water ruins almost everything in the long run, but the fairings are a composite ...
5
votes
1answer
605 views

How was/Was Kalam-sat Recovered from the Ocean?

I was reading this article about Kalam-SAT and it states that: "Kalamsat fell into the sea. It will be recovered and NASA will be sending it back to us for decoding the data," [Srimathy Kesan, ...
6
votes
1answer
875 views

What is the minimal TWR of Falcon 9 booster right before touchdown?

A big point about Falcon 9 booster landing is that they need to stick the landing on the first try; they can't just hover and adjust position because even fully throttled single Merlin engine provides ...
20
votes
2answers
3k views

Will SpaceX delay launches, if the landing site weather is unacceptable?

With the initial landing attempts, it was not a big deal, twas all an experiment and they only reused Block 1-4 boosters once at best. So holding a launch because of weather at the landing site ...
1
vote
0answers
78 views

Transportation on the Mars I Air

Due to the thin atmosphere generating lift on Mars is difficult at a lower speed, Flying is hard until aircraft go supersonic and then it becomes difficult to control(Ref.). The landing would not be ...
4
votes
6answers
505 views

What would be a few challenges to build a landing strip on mars?

So we are spending a lot of money to get things landed vertically. Its a challenge, and obviously tough too. So here is the idea. Get to mars. land over there, no need to return to earth (if no ...
45
votes
3answers
13k views

Why is an airbag landing on the moon not viable?

In this related question, it was explained that the differences in design between a Mars rover and moon rover were too substantial to substitute one for another. One of the points made was that the ...
21
votes
5answers
8k views

Olympus Mons - viable Mars landing site?

I'm becoming interested in how Mars missions are planning their landings. One aspect I see brought up time and again is Mars' awkward atmosphere - 'just enough there that you have to care about it'. ...
5
votes
1answer
530 views

Could Space Shuttle's wings be diminished?

From Wikipedia The crucial factor in the size and shape of the Shuttle orbiter was the requirement that it be able to accommodate the largest planned commercial and military satellites, and have ...
16
votes
2answers
2k views

How does a landing spacecraft control main parachute inflation?

In a recent post from SpaceX about Crew Dragon parachute test you can see how the main parachutes are deployed in semi-folded state, after a while they inflate a bit and after another while they ...
5
votes
1answer
104 views

Would landing on mars during a storm considerably increase atmospheric drag?

Any chance we could harvest all those dust particles for an significant improvement in aero-breaking capabilities or would it destroy most heat-shields?
17
votes
2answers
2k views

Why is the first stage from the Falcon 9 SES-12 mission not recovered?

Youtube video here At 4:13 minutes into the Iridium-6/GRACE-FO NASA Launch, the commentator mentions: The first stage is not going to be recovered, so there won't be any views from the drone ship ...
4
votes
3answers
213 views

Is Mid-Air Deployment of the Mars Helicopter Feasible?

According to a recent news announcement1, NASA is going to send a small helicopter to Mars for testing purposes. Future landers could carry more of these future rotorcraft [that might] act as ...
16
votes
2answers
2k views

What are the disadvantages of parachute+airbag for atmospheric landing, versus rocket-based?

After Sojourner success, repeated by Spirit and Opportunity, it seemed like we had developed a fail-proof system for atmospheric landing for our probes: there's very little that can go wrong with the ...
3
votes
1answer
78 views

Would a large impactor on an ice moon cause a thinning of the ice surface?

While it has not been confirmed, Callisto (Jupiter IV) could potentially have a small subsurface ocean below a thick ~100 km ice layer, according to Wikipedia. A mission to explore that ocean might ...
55
votes
2answers
23k views

How does the Falcon 9 first stage avoid burning up on re-entry?

Now that a Falcon 9 first stage has successfully landed after a launch mission, I want to know how the first stage can avoid burning up when coming back down to earth. There doesn't appear to be any ...
4
votes
2answers
224 views

SpaceX May 11, 2018 Falcon 9 launch had no boostback burn

One of my questions regarding the May 11 launch is Why no boostback burn? I assume that without such a burn, Stage One would continue on at about 8,000 km/hr in an EASTWARD direction, away from the ...
11
votes
1answer
1k views

How does a gamma ray altimeter work? What kind of sensor is used?

The answers to the Space SE question Soyuz landing ground detection really surprised me. A gamma ray altimeter is used by the returning Soyuz capsule to detect the presence of solid ground immediately ...
4
votes
3answers
655 views

Will SpaceX land the first stage for the TESS mission on land or a barge?

I may have the opportunity to watch the upcoming Falcon 9 launch of NASA's TESS mission in person. Because of this, I'm curious whether I'll be able to watch the first stage of the Falcon 9 land back ...
1
vote
2answers
411 views

SpaceX Raptor engined first stage landing

Reusability is a key strategy for SpaceX to lower the cost of orbital and interplanetary launches. With the Falcon 9 they are using the powered landing approach to recover the first stage for reuse. ...
22
votes
2answers
5k views

Could SpaceX land on the moon today?

Now that SpaceX has a bunch of flown Block 4 Falcon 9 rockets laying around, could they theoretically do a mission to the Moon with landing even if it's just a rocket with no payload? Does it work out ...
7
votes
2answers
2k views

Why did the Falcon Heavy core engines fail to reignite?

I realize that this is a hot take, less than twenty-four hours later at the time of posting, but is any technical detail known about why the core engines failed to restart, causing the crash?
1
vote
1answer
184 views

How can one ensure safety of the crew capsule if the rocket blows up at max dynamic pressure?

In general, say the rocket like the Soyuz blows up any time during flight (not on the ground). Is there some way to ensure that the crew capsule can be returned safely back. If it is high enough but ...
54
votes
4answers
40k views

What was the fate of the main core of the first Falcon Heavy launch?

February 6th 2018 saw the first test launch of SpaceX's Falcon 9 Heavy rocket. During the main core's landing on the marine landing pad, the connection was lost. As such it is not immediately clear ...
12
votes
3answers
4k views

Could a Soyuz land in water?

While watching Soyuz exp. 37/1 land, I was struck with a thought: that capsule looks an awful lot like a submarine. This seems to be a problem if the crew ever needed to make an emergency landing ...
16
votes
2answers
5k views

Did the fairings from the Falcon Heavy test flight get recovered?

According to the flight plan that Elon Musk posted on Twitter, there's a section listed as 'Fairing Recovery', was this section successful? Did the Fairings get recovered?
6
votes
2answers
2k views

Why were three engines used for the F9 1st stage landing burn (BulgariaSat-1)?

As pointed out in the question What is the “emergency crush core”?, an Elon Musk tweet about the Falcon 9 1st stage landing following the BulgariaSat-1 launch says: Rocket is extra toasty and hit ...
17
votes
3answers
3k views

SpaceX first stage landing: Why not use an elevated net above the landing platform to catch the rocket?

The rocket would keep same descent system as now (no parachute). But instead of landing on feet, it would have long grid fins on its top that would be catched by an elevated cable net. The previous ...
15
votes
2answers
2k views

What is the cause of this Falcon 9 first stage “dance” after landing?

Recently I watched a video on YouTube by Scott Manley: How To Do A Hoverslam - Things Kerbal Space Program Doesn't Teach. It deals about landing burns of Falcon 9 first stages. It features short clips ...
18
votes
2answers
6k views

How will SpaceX achieve landing of the Falcon 9 first stage?

What mechanisms and technologies will be used to control the descent and movement of the falcon 9 rocket's booster stage on its way to the landing pad?
19
votes
2answers
3k views

On the Falcon Heavy, why are the side boosters using Ti Grid fins, but not the center core?

Elon Musk showed a picture of the almost ready to fly Falcon Heavy in the HIF (Horizontal Integration Facility, aka rocket barn). You can see the darker, larger grid fins on the side cores, and the ...
10
votes
3answers
3k views

Is it possible for something to fall straight down to earth? What are the requirements?

Meteorites leave strewn-fields before impacting, SpaceX rockets come in at an angle and stand up straight at the last second, the Soyuz capsule doesn't fall straight. I assume this has to do with the ...
12
votes
3answers
840 views

Why does one leg open slower than others on Falcon 9 landings?

I had noticed this before, but when landing, the legs do not open at exactly the same time or speed. For the CRS-13 mission, it was really obvious in this video around 50 seconds into the video. ...
8
votes
1answer
349 views

How will they lower the landed side boosters after landing, if there is a nose cone?

To lower/handle landed stages, SpaceX has a rig that connects to the inter stage and they use it as an attach point for the crane to lift/move it. The two cores landed in Florida after the first ...

1 2
3
4 5
7